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I do not recommend coating to try and resolve HV arcing/corona issues. First identify the actual source/cause of the problem, then you will know how to resolve it. Use the small flexible hollow tube method to locate the actual source. The paper towel cardboard roll is too big and not flexible. You may have to remove HV covers, or pull the chassis to locate it. If you pull the chassis, you will likely need to have the focus coil and yoke hooked up. You need not have the CRT HV hooked up.
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John Folsom
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